Are you going to the Olympia?
Or watching it online on a stream?
I depends on what you want. If you want to be close enough to actually see the competitors Id pay it. If not you can just as easily watch on big screen from back row. I personally enjoyed floor seats. I went with my wife several times and a good suggestion is ignore the women trying to get your attention!
Get the VIP tickets or you'll be waiting in line for 2-3 hours just to get inside.